Impedance buffer for driving capacitive loads

Details Impedance buffer for driving capacitive loads Impedance buffer for driving capacitive loads

1993-09-30

1995-05-09

Sikes, William L.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Nonlinear amplifying circuit

327563, 327427, G06G 712

Patent

active

054143829

ABSTRACT:
An impedance buffer circuit suitable for monolithic implementation as a capacitive load driver such as required in sample-and-hold circuit applications. This impedance buffer circuit provides the speed of the emitter-follower amplifier and the accuracy of the differential amplifier without the normal output offset, excessive overshoot and ringing or slew rate limitations. An emitter-follower amplifier element is coupled to operate in parallel with a differential amplifier element, which may be optimized for performance over the final 0.7 volt (V.sub.be) portion at each end of the output voltage range.

REFERENCES:
patent: 4389579 (1983-06-01), Stein
patent: 4542305 (1985-09-01), Blauschild
patent: 5172016 (1992-12-01), Dobberpuhl
Chu Phoon Chong, Kenneth C. Smith, Zvonko G. Vranesic, Using Active Components to Perform Voltage Division in Digital-to-Analog Conversion, IEEE Journal of Solid-State Circuits, vol. 24, No. 4, Aug. 1989, pp. 999-1002.
Microelectronics: Digital and Analog Circuits and Systems, Peter D. Nalle, et al. Eds., pp. 596-598, McGraw-Hill, Inc., 1979.

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